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11586 SPENSA- ORONO -revised 5-28-09 Type 11 24-hr 10 yr Rainfall=4.20" <br /> Prepared by{enter your company name here} Page 9 <br /> HydroCADO 8.00 s/n 000837 ©2006 HvdroCAD Software Solutions LLC 6/17/2009 <br /> Subcatchment 213: PROPOSED <br /> Runoff = 0.76 cfs @ 12.02 hrs, Volume= 0.049 af, Depth> 3.90" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span=4.00-27.00 hrs, dt= 0.05 hrs <br /> Type II 24-hr 10 yr Rainfall=4.20" <br /> Area (sf) CN Description <br /> 6,630 98 Paved parking & roofs <br /> 6,630 Impervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feet) (ft/ft) (ft/sec) (cfs) <br /> 11.0 Direct Entry, Typical Inspection <br /> Subcatchment 2X: EXISTING <br /> Runoff = 0.73 cfs @ 12.03 hrs, Volume= 0.047 af, Depth> 3.72" <br /> Runoff by SCS TR-20 method, UH=SCS, Time Span=4.00-27.00 hrs, dt= 0.05 hrs <br /> Type II 24-hr 10 yr Rainfall=4.20" <br /> Area (sf) CN Description <br /> 1,140 85 Gravel roads, HSG B <br /> 5,490 98 Paved parking & roofs <br /> 6,630 96 Weighted Average <br /> 1,140 Pervious Area <br /> 5,490 Impervious Area <br /> Tc Length Slope Velocity Capacity Description <br /> (min) (feet) (ft/ft) (ft/sec) (cfs) <br /> 12.0 Direct Entry, Typical Inspection <br /> Pond RAIN G: POND 1 <br /> Inflow Area = 0.977 ac, Inflow Depth = 2.92" for 10 yr event <br /> Inflow = 4.20 cfs @ 12.01 hrs, Volume= 0.237 of <br /> Outflow = 0.06 cfs @ 18.67 hrs, Volume= 0.084 af, Atten= 98%, Lag= 399.3 min <br /> Discarded = 0.06 cfs @ 18.67 hrs, Volume= 0.084 of <br /> Primary = 0.00 cfs @ 4.00 hrs, Volume= 0.000 of <br /> Routing by Stor-Ind method, Time Span=4.00-27.00 hrs, dt= 0.05 hrs <br /> Peak Elev= 1,022.46' @ 18.67 hrs Surf.Area=4,608 sf Storage= 7,591 cf <br /> Plug-Flow detention time= 448.3 min calculated for 0.084 of(35% of inflow) <br /> Center-of-Mass det. time= 321.8 min ( 1,126.7- 804.9) <br />